GRAMINACEyE. 449 



Leaves very soft, pubescent. Panicle 3 — 4 inches long. Sjnkelefs nearly erect, 

 5 — 10-flowered. The seeds are said to be deleterious. Introduced from Europe. 



Soft Brome-grass. 



4. B. purgans Linn. : panicle oblong, somewhat contracted, at length 

 nodding ; spikelets oblong-lanceolate, ovate-oblong when old, 7 — 8-flowered ; 

 flowers hairy ; awn straight, nearly as long as the paleae. 



Moist woods. Arct. Amer. to Car. W. to Ohio ; rare. July, Aug. %. — 

 Culm 2 — 3 feet high, pubescent at the nodes. Leaves flat, somewhat hairy. 

 Panicle about 3 inches long, with short nearly simple branches. 



Canadian Brome-grass. 



5. B. ciliatus Linn. : panicle loose, nodding ; spikelets oblong, terete, 

 8 — 12-fiowered ; flowers appressed-pubescent, longer than the straight awn. 

 B. Canadensis Mich. 7 ' 



Woods. Can. to Penn. June. %■. — Culm 3 — 5 feet high, striate, the nodes 

 black and hairy. Leaves broad-linear, hairy above, smoothish beneath. Pan 

 icle 6—8 inches long ; the branches filiform, rough. Ciliate Brome-grass. 



6. B. jmbescens Muhl : panicle loose, nodding ; spikelets lanceolate, sub- 

 terete, 8 — 12-flowered ; flowers pubescent, rather longer than the straight 

 awn. 



Woods. 3Iass. to Car. W. to Ohio. June. %.. — Culm 3 — 4 feet high, some- 

 what hairy below, the nodes black. Leaves lanceolate, hairy above, smooth be- 

 neath. Panicle loose, at length nodding, with slender flexuous branches. 



Pubescent Brome-grass. 



7. B. arvensis Linn. : panicle erect, spreading ; spikelets lanceolate, com- 

 pressed, 7— 8-flowered ; flowers imbricate, compressed, smoothish, about as 

 long as the straight awn. 



Fields and meadows. West Chester, Penn. Darlington. June, July. (J). 

 — Culm about 2 feet high, smooth ; nodes nearly black, pubescent. Leaves 

 lance-linear, hairy on both sides. Panicle slender, spreading, at length droop- 

 ing. Introduced from Europe. Field Brome-grass. 



49. UNIOLA. Linn.— Spike Grass. 



(Probably so named because the lower flowers of the spikelet consist only of a 

 single palea. Torr.) 



Spikelets compressed, many-flowered, one or more of the 

 lower flowers sterile, and consisting of a single palea. Glumes 

 keeled. Paleae of the perfect flowers 2 ; lower one boat-shaped ; 

 upper smaller, doubly keeled. Stamens 1 — 3. — Panicle com- 

 pound, loose. 



1. U. latifolia Mich.: leaves broad and flat; panicle loose, nodding; 

 spikelets on long peduncles ; flowers somewhat falcate, monandrous. 



Mountains. Penn. to Geor. Aug. %.—Culm 2—3 feet high, somewhai 

 branching. Panicle a foot long, loose. Broad-leaved Spike-grass. 



2. U. gracilis Mich. : panicle elongated, racemose, appressed ; spikelets 

 3 _4-flowered ; flowers spreading, monandrous. Holcus laxus Linn. 



Sandy swamps. N.Y. toGeor. Aug. Ij..— CwZm 3— 4 feet high, cespitose, 

 slender, somewhat compressed, leafy. Leaves a foot or more long, narrow, flat. 

 Panicle 6 — 10 inches long, very slender, with short remote branches. 



Slender Spike-grass. 



